Clamp for foundry-flasks.



' PATENTED AUG. 7, 1906.

0. F. LINDBERG. CLAMP FOR FOUNDRY FLASKS.

APPLICATION FILED 14H. 8. 1906,.

21% humus QWMQQ 1n: NORRIS PETERS cm, WASHINUTON. n. c.

UNITED STATES PATENT OFFICE.-

Specification of Letters Patent.

Patented Aug. '7, 1906.

Application filed January 8, 1906. Serial No. 295.122.

To all whom it may concern.-

Be it known'that I, OsoAR Fv LINDBERG, a citizen of the United States,and a resident of Bradford, in the county of McKean and State ofPennsylvania, have invented certain new and useful Improvements inClamps for Foundry-Flasks, of which the following is a specification.

This invention relates to clamps for foundry-flasks. Owing to the roughusage to which clamps of this kind are subjected it is necessary toconstruct them with a great amount of strength. With clamps that are notadjustable it is not hard to provide a strong and durable construction;but with adjustable clamps a different problem is presented; and theobject of my invention is to accomplish this end with this latter typeof clamp.

Other and further objects will appear in the following description andwill be more particularly pointed out in the appended claim.

In the drawings, Figure 1 is a perspective view of a foundry-flask withthe sections held together by my improved clamp. Fig. 2 is a sectionalview of the flask, showing the m0v. able jaw of the clamp in section.Fig. 3 is a side elevation of the fixed jaw and shank. Fig. 4 is aperspective view of the movable jaw, and Fig. 5 is a perspective view ofthe usual foundry-wedges.

Referring more particularly to the drawings, 1 indicates themold-sections, and 2 the foundry-wedges, which cooperate with the clampto obtain small adjustments. The clamp comprises three parts'the fixedjaw 3, the shank 4, and the movable jaw 5, adapted to slide on the shankand prevented from sliding off of the said shank by lugs 6, extendingfrom opposite sides thereof.

To hold the movable jaw 5 in various positions, thereby providing forits adjustment on the shank, the shank is provided on its rear face witha plurality of notches or grooves 7, preferably semicylindrical in form,one wall 8 of each of which is inclined and is longer than its otherwall 9, while the face of the shank between the short wall and the longwall of adjacent grooves is beveled or inclined at 10.

To permit the movable jaw to slide on the shank and to interlocktherewith, the movable jaw is provided with a shank-opening having aportion 11 of its rear wall adapted to engage any one of the inclinedfaces 10 on the shank when a semicylindrical lug 13, also on the rearwall of the shank and at the end nearest the clamping-face of the jaw-opening, enters the notch 7 at the lower end of an inclined face 10.The front or other wall 14 of the shank-opening is formed to permit amovable jaw to turn to throw the lug 13 and portion 11 of rear wall ofthe shank-opening out of contact with the walls of the groove 7 and theincline face 10. To permit the clamping-face of the movable jaw to beparallel with the clamping-face of the fixed jaw, the movable jaw isdeflected or bent at 15.

In operation the rough adjustment of the jaws is first obtainedthat is,the movable jaw is moved toward the stationary jaw, but not so far thatthe mold-sections are clamped between them, as it is desirable to employthe ordinary foundry-wedges 2. The employment of the foundry-wedgesmakes it possible to secure a greater clamping action, and after themolding operation is completed it requires but a blow of the hammer onthe wedges to release the clamp.

The inclined faces 10 assist the notches in holding the movable jaw, andshould the lug 13 or the short wall of the notches break or become wornthe inclined face alone will hold the jaw against movement. Further,this adjustment is particularly adapted for foundry-clamps, which aresubjected to very rough treatment and must. be exceedingly strong in allparticulars. Another advantage of this adjustment is that there are nosmall joints or crevices in which sand is liable to stick.

Having thus described my invention, what I claim, and desire to secureby Letters Pat ent, is

In a foundry-clamp, a fixed jaw to engage with one mold-section, a shankprovided with a plurality of grooves and inclined faces between ad'acentgrooves, and a movable jaw having a lug to enter any one of the grooves,and a face to contact with an inclined face on the shank when the lug isin one of the grooves.

The foregoing specification signed at Bradford, Pennsylvania, this 28thday of December, 1905.

OSCAR F. LINDBERG. In presence of F. A. HERPEL, O. A. FAY.

